Treaty of Verdun — The parting of Carolingian Empire by the Treaty of Verdun in 843. Pink area indicates West Francia.Green area indicates Middle Francia.Yellow area indicates East Francia.
Photo Credit: By Scan made by Olahus - Histoire Et Géographie - Atlas Général Vidal-Lablache, Librairie Armand Colin, Paris, 1898., Public Domain, https://commons.wikimedia.org/w/index.php?curid=5247494